Attachment plug



July l2, 1932. J. P. EAsTMAN ATTACHMENT PLUG Filed Nov. 19

Patented luly 121, 1932 UNITLD STATES PATENT OFFICE JOSEPH PETER .'EASTM'AN, OF-MANITOWOCfWISCONSIN, ASSIGNOR TO ESTMAN MFG.

. C0., OF- IMANITOWOC, WISCONSIN, l.A CORPORATION ATTACHMENT PLUG Application led November This invention relates to an attachment plug, and is'particularly directed to means for relieving the strain of the cord leading to the plug.

Objects of this invention are to provide a device which is so constructed that it may carry the usual thimbles for receiving the prongs of an electrical device, 'such for instance as an iron, toaster, or other apparatus, and whichis so constructed that the at'- tached ends of the cord are held permanently in place without placing any strain thereon even if the main cord should be inadvertently pulled.

of device for supporting the cord and preventing its being broken by a sharp bend, and to so organize this device that it is rigidly secured within the insulating member or head enclosing the thimbles.

An embodiment of the inventionis shown in the accompanying drawing, in which Figure 1 is a view of the device with parts broken away, j Figure 2 is an enlarged view tion with parts broken away. Figure 3 is a section on the line 3 3 of Fi ure 2.

-eferring to the drawing, it will be seen that the device comprises a head 1 of insulating material formed of two members slit along a longitudinal plane..

These members arey provided with chanpartly in secnels 2 which receive the thimbles 3 of the device. `These thimbles are provided with screws 4 at their inner ends which receive the terminals of the wires 5 carried l1n thev cables 6. It is to be noted that the head or enclosing member 1 is provided with a tuloular neck 7 which is equipped with an annular vrecess 8 having a hexagonal periphery. Within this recess, the hexagonal Harige 9 of a nipple or body piece 10 is positloned, such nipple/'projecting outwardly therefrom and having a'threaded extension, and a nut or union-like member or shell 11 is also provided with an internally threaded portion so that the threads may. be screwed together, as indicated at 12 in Figure 2. This nut is provided with an outwardly elongated hub 13 Further objects are to provide a novel form` 19, 1925. serial No. 70.024.

provided with a plurality of grooves 14 therein forming a helix to receive and retain the helical supporting coil 15 (seel Figure 1). The outer end of such coil carries an insulating bushing 16. This coil, it" will be seen, is rigidly held upon the -hub of the nut, and the nut is in turn carried by the rigidly held nipple 10.

The juxtaposed portions of the nut and of the nipple are provided with curved faces e0 17 and 18 which receive between them the clamping sleeve 19. This clamping sleeve is provided with a spherical external surface and with a plurality ofslo'ts 2O to permit its contraction. The Ainternal surface of the clamping sleeve 19 is provided with small serrations 21 which grip the cable 6 when the nut is screwed into place. ltwill be seen that the cable is gripped by the gripping sleeve 19 and prevented from being withdrawn from the apparatus, thus relieving the attached ends of the cable from strain.

Further, it will be particularly noted that v the nipple 10 is rigidly carried within the recessed portion of the neck 7 of the head of the device. This nipple also rigidly carries the nut 11 which in turn supports the helical coil 15.. Thus inadvertent shifting of the supporting portions is prevented and further rotary inotion is prevented, as the hexagoal flange 9 lits accurately the hexagonal recess 8 of the neck.

It Willbev seen that a very serviceable and practical type of electrical fixture has been provided which has novel characteristics, and whichfulfills a lon`g felt want, affording the utmost security of attachment ofthe cable and adequate support therefore adjacent the head of the device. i 4

Although the invention has been described in considerable detail, such description is inf tended as illustrative rather than limiting as the invention may be variously embodied and as the scopel of such invention is t0 be deter-h 95 mined as claimed. I

I claim: e An attachment plug of the character described includinga body nipple having an fannular curved inner face at one end there- '10o v\ cooperate with the threads on you of, a hexagonal ange around the exterior of the body at on the exterior of the body at the end provided vviththe annular curved face, an elongated hub having an enlarged 'portion with an inner curved face and an inner threaded portion adjacent the curved face adapted to ple, a clamping sleeve having a spherical eX- ternal surface adapted to cooperate with the curved face on the body nipple and the hub, said clamping sleeve having a plurality of slots extending inwardly from the ends thereof whereby when the elongated hub is threaded onto thebody nipple, the clamping sleeve will `be contracted and a plurality of serrations on the inner face of the clamping sleeve adapted to be moved a 4yieldable object arranged in the'sleeve.

In testimony that I claim the foregoing I have hereunto set my hand at Manitowoc, in the c :ounty of Manitowoc and State of Wisconsln.,

JOSEPH PETER EASTMAN.

the other end, screw threads y the body vnipinto engagement with 

